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HTML

CSS

CSS Base

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Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

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Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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Code Indentation

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HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              - var dim = 2;
- var boxes = { border: '#f90', padding: '#95a', content: '#b53'};

body(style=`--dim: ${dim}` data-dim=dim)
	form
		div.toggle(role='group' aria-label='Switch between 2D and 3D view for the graphics below.')
			- for(var i = 0; i < 2; i++) {
				input(type='radio' name='dim' id=`dim${i}` value=i + 2 checked= dim === i + 2)
				label(for=`dim${i}` style=`--i: ${i}`) #{i + 2}D
			- }
			div.toggle__vis(aria-hidden='true')

	section(role='graphics-document' aria-label='Shows how backgrounds are layered, animating from 2D to 3D.')
		.a3d
			- var i = 0;
			- for(var p in boxes) {
				.layer(data-box=p style=`--c: ${boxes[p]}; --m0: ${1 - (i > 1)}; --m1: ${1 - (i > 0)}`)
					code.info #{p}-box
					if p !== 'content'
						.meas #{p[0]}
					.round
						.txt r#{p === 'border' ? '' : ` - b${p === 'padding' ? '' : ' - p'}`}
				- ++i;
			- }

	pre
		span.token--decl
			span.token--prop border
			span.token--punc :
			|  
			span.token--val
				span.token--keyw solid
				|  
				span.token--len $b
				|  
				span.token--col transparent
				span.token--punc ;
		span.token--decl
			span.token--prop padding
			span.token--punc :
			|  
			span.token--val
				span.token--len $p
				span.token--punc ;
		span.token--decl
			span.token--prop border-radius
			span.token--punc :
			|  
			span.token--val
				span.token--len $r
				span.token--punc ;
            
          
!

CSS

            
              $c-dark: #333;
$c-light: #c7c7c7;
$c-main: #d92727;
$c-sec: #ff6fff;

$pen-b: .125em;
$pen-p: .125em;
$pen-r: .25em;
$pen-g: 1vw;

$btn-d: 1em;

$cell-w: $btn-d + $pen-b + $pen-p;

$t: .7s;

$box-min: 7em;
$box-max: 25em;
$box-d: 39vw;
$box-b: 1.5em;
$box-p: 1.5em;
$box-r: 5em;

$line-w: 2px;
$line-o: calc(#{-.5*$line-w} - var(--m0)*#{$box-b});

*, :before, :after {
	--j: calc(1 - var(--i));
	box-sizing: inherit;
	margin: 0;
	color: inherit;
	font: inherit;
}

body {
	--f3d: calc(var(--dim) - 2);
	--c3d: calc(1 - var(--f3d));
	display: flex;
	flex-direction: column;
	align-items: center;
	overflow-x: hidden;
	min-height: 100vh;
	background: $c-dark;
	color: $c-light;
	font: 1.375em/ 1.25 consolas, monaco, monospace;
	
	@media (max-width: 350px) { font-size: 1em }
	
	@media (max-width: 260px) { font-size: .875em }
	
	@media (max-width: 225px) { font-size: .75em }
	
	@media (max-width: 190px) { font-size: .625em }
}

form, pre {
	padding: .5em 1vw
}

.toggle {
	display: grid;
	place-items: center;
	grid-template: 100% / 1fr repeat(2, $cell-w) 1fr
}

[type='radio'] {
	position: absolute;
	left: -100vw;

	+ label {
		grid-row: 1;
		grid-column: calc(2*var(--i) + 1)/ span 2;
		position: relative;
		z-index: 1;
		padding: 0 $pen-r;
		margin: 0 calc(var(--j)*(#{$cell-w} + #{$pen-g})) 
			0 calc(var(--i)*(#{$cell-w} + #{$pen-g}));
		width: max-content;
		border-radius: $pen-r;
		white-space: nowrap;
		cursor: pointer;
		transition: $t;
		
		&:before {
			--cover-w: calc(#{$cell-w} + #{$pen-g});
			position: absolute;
			left: calc(var(--j)*100% - var(--i)*var(--cover-w));
			width: var(--cover-w);
			height: 100%;
			content: ''
		}
		
		&:first-of-type { justify-self: end }
	}
	
	~ [aria-hidden='true'] {
		grid-row: 1;
		grid-column: 2/ span 2;
		position: relative;
		z-index: 0;
		border: solid $pen-b $c-light;
		padding: $pen-p;
		width: 2*$btn-d; height: $btn-d;
		border-radius: $btn-d;
		color: $c-sec;
		transition: color $t;
		
		&:before {
			position: absolute;
			width: $btn-d; height: $btn-d;
			border-radius: 50%;
			transform: translate(calc(var(--f3d)*100%));
			background: currentcolor;
			transition: transform $t;
			content: ''
		}
	}

	&:checked + label {
		color: $c-sec
	}

	&:focus, &:hover {
		+ label {
			background: $c-main;
			color: $c-light
		}

		~ div { color: $c-main }
	}
}

section {
	flex: 1;
	width: 100%; min-height: 500px;
	position: relative;
	box-shadow: inset 0 -7px 7px -7px #000, 
		inset 0 7px 7px -7px #000;
	color: #fff;
	
	*, :before, :after {
		position: absolute;
		transform-style: preserve-3d
	}
}

.a3d { top: 50%; left: 50% }

.layer {
	border: solid calc(var(--m0)*#{$box-b}) transparent;
	padding: calc(var(--m1)*#{$box-p});
	min-width: $box-min; min-height: $box-min;
	width: $box-d;
	max-width: $box-max; max-height: $box-max;
	--r: calc(#{$box-r} - (1 - var(--m0))*#{$box-b} - (1 - var(--m1))*#{$box-p});
	border-radius: var(--r);
	--pos: translate(-50%, -50%);
	transform: var(--pos)
		translatey(calc(var(--f3d)*((var(--m0) + var(--m1) - 1)*8em - var(--m0)*2em) - .625em))
		perspective(25em)
		rotatex(calc(var(--f3d)*53deg));
	background: linear-gradient(calc(var(--parity, 0)*.5turn), var(--c), #000) border-box;
	line-height: 1.5;
	text-align: center;
	transition: transform $t ease-out;
	
	&:nth-child(2n) { --parity: 1 }

	&:before, &:after {
		--i: 0;
		--o: calc(#{$line-o} + var(--i)*var(--m0)*#{$box-b});
		top: var(--o); right: var(--o); bottom: var(--o); left: var(--o);
		border: dashed $line-w $c-light;
		border-radius: calc(var(--r) + #{.5*$line-w} - var(--i)*var(--m0)*#{$box-b});
		opacity: calc(.2 + var(--c3d)*79);
		content: ''
	}
	
&:after { --i: 1 }
}

.info {
	top: calc(var(--m0)*#{-$box-b});
	right: 0; left: 0;
	transform: translate(calc(var(--f3d)*-2em), calc(var(--f3d)*(var(--m0) + var(--m1))*#{$box-b}));
	transition: $t
}

.meas {
	bottom: calc(var(--m0)*#{-$box-b}); left: 50%;
	border-right: solid currentcolor;
	padding-right: .75em;
	transform: translate(-50%);
	opacity: calc(.2 + var(--c3d)*.79);
	transition: opacity $t;
	
	&:before, &:after {
		--i: 0;
		top: calc(var(--i)*100%); right: -.5*$line-w;
		border: solid 0 transparent;
		border-color: rgba(#fff, var(--i)) transparent rgba(#fff, var(--j));
		border-width: .5em .1875em;
		transform: translate(50%, -50%);
		content: ''
	}
	
	&:after { --i: 1 }
}

.round {
	--o: calc(var(--m1)*#{-.5*$line-w} - var(--m0)*#{$box-b});
	right: var(--o); bottom: var(--o);
	border: dashed $line-w rgba(#fff, .32);
	border-right-color: currentcolor;
	padding: calc(var(--r) - #{.5*$line-w});
	border-radius: 50%;
  transform: rotate(45deg);
  opacity: calc(.2 + var(--f3d)*.79);
	background: 
		radial-gradient(currentcolor $line-w, transparent calc(#{$line-w} + 1px)), 
		linear-gradient(45deg, transparent calc(50% - #{.5*$line-w}), currentcolor 0, 
				currentcolor calc(50% + #{.5*$line-w}), transparent 0) 
			100% 100%/ 50% 50% no-repeat, 
		linear-gradient(-45deg, transparent calc(50% - #{.5*$line-w}), currentcolor 0, 
				currentcolor calc(50% + #{.5*$line-w}), transparent 0) 
			100% 0/ 50% 50% no-repeat
}

.txt {
	transform: translate(-50%, -50%)
		rotate(-45deg)
		translate(calc(-50% - .5em), calc(.5*var(--r)));
	word-spacing: -.375em;
	white-space: nowrap
}

pre {
	line-height: 1.5
}

.token {
	&--decl {
		& + &:before { content: '\A' }
	}
	
	&--prop { color: #c2ff96 }
	
	&--keyw { color: #ff8a8a }
	
	&--len { color: #fffb4a }
	
	&--col { color: #9ab9ff }
}
            
          
!

JS

            
              addEventListener('change', e => {
	document.body.style.setProperty('--dim', document.body.dataset.dim = +e.target.value)
}, false);
            
          
!
999px

Console